Intake manifold



Feb. 17, 1931. A. w. FREHSE INTAKE MANIFOLD Filed Feb. 7, 1927 2 sheets-sh et 1 az/a/ 2);

Patented Feb. 17, 193i PATENT former.

.4333? WHGQIAM FBEHSE, Q DETROIT, MICHIGAN, ASSIGNOR To GENERAL MOTORS QRAT QN, O D TR I ICH A CORPORATION OF DELAWARE INTAKE MANIFOLD Application filed February 7, 1927. Serial No. 166,560.

This inyention relates to internal combuson eng nes. particularly to improvements in the heating of the carburetted mixture before it isdrawn nto the fi ing chamber, and inthe 95 application of an air straightener in the inak ma ifo d.

The exhaust manifold preferably has a special shape adapted to suit the needs ofmy invention, and for this purpose I provide a plurality depressed arched protuberances Q1, bulges a th bottom thereof into which enter the leads from the intake manifold. In each of these bulges I locate an air or flow straightener (which per se forms no part of I my invention) and the construction is such that the hot exhaust gas may circulate around the air straightener.

The air straightener may be positioned in the exhaust manifold in a number of ways.

a9 The heat may be applied directly to the straightener; or a metallic cylinder'or collar closely surround the straightener and the exhaust gases caused to come in contact with the cylinder; or I may allow a space he tween the collar and straightener and apply the heat to the collar thereby causing the heat to pass through the air space between the. o lar an h tra ght er.

The invention is disclosed in the accomajg panying drawing in. which Figure 1 is a side View of so much of an internal: combustion engine as. is necessary to illustrate my invention.

Figure 2 is a plan View of the structure shown in Figure 1.

Figure; 3 is a section on the lines 3-3 of Figures 1 and- 4 with the air straightener shown in full lines.

' Figure 4 is a section on the line H of Figures 2 and-3 showing the outer portion nl of th ir s r g tene Figures 5 and 8 are views similar to Figure ill 4 but showing modified forms of my inven-' ther .modification with shown in full lines.

Referring to Figure 1, 1 designates an internal combustion engine of any suitable type, 2 is the exhaust manifold, 3 the intake manifold, d the carburetor and 5 the exhaust tube.

By referring to Figures 2, 3 and ff it will be seen that I' have provided the intake 1nanifold with a plurality of protuberances or bulges 17 at its lower portion and in these bulges are located the air straighteners 18. This straightener is shown as cylindrical but obviously may be of any suitable form. Surrounding each air straightener and in close contact therewith is a cylinder 20 having a flange 19 at one end resting on a seat 21 of the intake manifold and at its other end a flange 22 bent at right angles and seated in a recess 23 at the outer portion of the intake manifold. Surrounding-the collar 20 there is aspace 24 the purpose of which is to permit the hot exhaust gases to circulate around the collar.

An air straightener in practice is a copper tube having a honey comb like filler so as to form a plurality of small passages instead of a single large one. The carbureted fuel as it comes from the carburetor through the intake manifold is in a turbulent state and the purpose of the air straightener is to force the fuel mixture through thesmaller passages of theair straightener andthereby decrease its turbulence and give it asmoother and moreeven flow to the firing chamber.

The intake manifold 3 issecured to the: face of the exhaust manifold by means of a clamping ring 34 and the usual gasket 25* is applied between the clamping ring: and the face -ofthe exhaust manifold.

The species 'of Figures 5 and'6 clif'fersfrom that show-nin Figures 3 and4' in that a space 26-is allowed hetweenthe collar 20and the air straightener 18 andinstead of the out-- wardly bentflange 23:0f Figure 3; the collar 20 has an inwardly directed-'fiange23' which contacts. with the outer end of. the" air straightener.

lnrthe speciesshown in. Figures-7 and 8 I showthe air straightener positioned? toreceivevthe heat: direct from the exhaust gases;

the air straightener In this species no collar is used but a space 27 is provided between the air straightener 18 and the bulge 17. This bulge 17 entirely surrounds the air straightener and the heat from the exhaust gases is communicated to the straightener across the wall of the bulge 17' and the space 27. At the outer end of the recessed portion there is provided an internal annular flange 28 which holds the outer end of the straightener 18.

In the species shown in Figures 3 and 6 the bulged portion 17 or 17' is provided with internal annular flanges 29 and 30 the purpose of which is to retain the collars 20 or 20 in their proper position. It Will also be noted that the lower portion at the bulges is exposed to the cooling effect of the atmosphere in each instance.

From an examination of the different species it will be apparent that the carbureted mixture will be heated by the transmission of heat from the hot exhaust gases to the air straightener through the metal walls of the collars 20, 20 or bulge 17, and the passages 24, 26 or 27. The amount of heating will depend upon which species is used, the heating being greater, for example, with the species of Figure 3 than with the species of Figure 6.

From an inspection of Figure 3 it is obvious that the collar 20 may have its flange 19 bent at right angles and applied similarly to the flange 22. Likewise, the recess 23 may be omitted and the flanges at both ends applied to the inner and outer faces of the bulged portion 17, as shown at 19 and 22 in Figure 9, in which case the collar forms its own gasket.

In order that the hot exhaust gases may be deflected toward the air straightener I preferably provide blades or flanges 29 at the top of the exhaust manifold, forming an arched structure as is shown at 30.

I claim:

1. In combination With an internal combustion engine having intake and exhaust manifolds associated therewith, flow straighteners in said intake and surrounded by said exhaust manifold, a collar surrounding each straightener, each collar being spaced from both straightener and exhaust manifold.

2. In a heating device as applied to internal combustion engines having a carburetor and intake and exhaust manifolds associated therewith, and means for heating the carbureted fuel, said heating means comprising a plurality of flow straighteners forming continuations of the intake manifold and located within the exhaust manifold.

3. In combination with an internal combustion engine having intake and exhaust manifolds associated therewith, means for heating the engine fuel mixture comprising a plurality of flow straightener units within the intake manifold and surrounded by said exhaust manifold, and a collar surrounding each straightener unit.

4. In combination with an internal combustion engine having intake and exhaust manifolds associated therewith, means for heating the engine fuel mixture comprising a plurality of flow straightener units Within said intake manifold and surrounded by said exhaust manifold, and a collar surrounding and embracing each straightener unit and secured to said exhaust manifold.

5. In combination with an internal combustion engine having intake and exhaust manifolds associated therewith, means for heating the engine fuel mixture comprising a plurality of flow straightener units within said intake manifold, and a collar surrounding each straightener unit, said exhaust manifold spaced from and surrounding said collars.

6. In combination with an internal combustion engine having intake and exhaust manifolds associated therewith, means for heating the engine fuel mixture comprising :1 plurality of flow straightener units surrounded by said exhaust manifold and within said intake manifold, a collar surrounding each straightener unit, and bulges in said e2;- haust manifold around said collars, said bulges spaced from said collars.

7. In combination with an internal combustion engine having intake and exhaust 1nanifolds, each manifold ha'ing a plurality of arms, means for heating the el gine fuel comprising a flow straightener in each arm of the intake manifold, straightener sureach rounded by an arm of the exhaust manifold. and a collar between each straightener and the exhaust manifold.

8. In combination with an internal combustion engine having intake and exhaust manifolds, each manifold having a plurality of arms, means for heating the engine fuel comprising flow straighteners forming continuations of each arm of the intake manifold and each straightener surrminded by an arm of the exhaust manifold, and collars surrounding said straighteners.

9. In combination with an internal combustion engine having intake and exhaust manifolds, each manifold having a plurality of arms, means for heating the engine fuel comprising flow straighteners forming continuations of each arm of the intake manifold and each straightener surrounded by an arm of the exhaust manifold, and collars surrounding said straighteners and spaced from said exhaust manifold.

In testimony whereof I affix my signature.

ALBERT WILLIAM FREl-ISE. 

